呷爬滑坡滑带土蠕变特性及其稳定性

水库滑坡变形破坏受其岩土体蠕变特性及环境因素的影响。当滑坡进入加速变形阶段后，变形骤然增大，失稳概率增加。为了研究滑坡岩土体蠕变特性及其稳定性，选取锦屏一级水电站呷爬滑坡为研究对象，采用坡表位移监测曲线分析与室内三轴蠕变试验相结合的方法，建立了Burgers蠕变模型结合FLAC3D软件进行了滑坡稳定性研究。分析坡表位移-时间曲线发现，坡体变形特征与一般滑坡土体的蠕变特征具有相似性，滑带土室内三轴蠕变试验结果表明，滑带土变形可划分为瞬时蠕变、减速蠕变与稳定蠕变3个阶段，同时其瞬时变形量、稳定蠕变速率均随围压以及应力水平的增大而增大。基于滑带土蠕变特性的Burgers蠕变模型的计算结果，对比了常规强度折减法与考虑蠕变的强度折减法的滑坡稳定性系数，计算结果表明呷爬滑坡目前处于稳定状态，在一个计算周期内考虑蠕变的强度折减法较常规强度折减法的稳定性系数下降了0.04，因此，揭示滑坡土体蠕变特性并在此基础上研究其稳定性具有实际意义。 

Creep properties and stability of sliding zone soil in Gapa landslide

Deformation and failure of reservoir landslide are affected by creep properties and environmental factors ofits rock and soil.Therefore, it is of great significance to study the creep properties and stability of landslide.In order to study the creep characteristics and stability of landslide rock and soil, taking Gapa landslide near Jinping Hydropower Station as the research object, combining the analysis of slope surface displacement monitoring curve with indoor triaxial creep test, and the Burgers creep model was established and FLAC3D software was used to study the stability of landslide.Analysis of the slope surface displacement-time curve shows that the deformation characteristics of the slope are similar to the creep characteristics of the general landslide soil.The indoor triaxial creep test shows that the deformation of the sliding zone soil can be divided into three stages:instantaneous creep, decelerating creep and stable creep.And its instantaneous deformation and stable creep rate increase with the increase of confining pressure and stress level.Based on the calculation results of the Burgers creep model based on the creep characteristics of the sliding zone soil, the stability coefficients of the conventional strength reduction method and the strength reduction method considering creep are compared.In one calculation cycle, the strength reduction method considering creep is reduced by 0.04 compared with the conventional strength reduction method.Therefore, it is of practical significance to reveal the creep properties of landslide soil and study its stability.